Bug 41881: Don't persist custom network requests on private windows

devtools/client/netmonitor/src/components/new-request/HTTPCustomRequestPanel.js

@@ -4,6 +4,11 @@
 
 "use strict";
 
+const lazy = {};
+ChromeUtils.defineESModuleGetters(lazy, {
+  PrivateBrowsingUtils: "resource://gre/modules/PrivateBrowsingUtils.sys.mjs",
+});
+
 const {
   Component,
   createFactory,
@@ -122,10 +127,12 @@ class HTTPCustomRequestPanel extends Component {
 
   async componentDidMount() {
     let { connector, request } = this.props;
-    const persistedCustomRequest = await asyncStorage.getItem(
-      "devtools.netmonitor.customRequest"
-    );
-    request = request || persistedCustomRequest;
+    if (!lazy.PrivateBrowsingUtils.isWindowPrivate(window)) {
+      const persistedCustomRequest = await asyncStorage.getItem(
+        "devtools.netmonitor.customRequest"
+      );
+      request = request || persistedCustomRequest;
+    }
 
     if (!request) {
       this.setState({ _isStateDataReady: true });
@@ -191,7 +198,9 @@ class HTTPCustomRequestPanel extends Component {
   }
 
   componentWillUnmount() {
-    asyncStorage.setItem("devtools.netmonitor.customRequest", this.state);
+    if (!lazy.PrivateBrowsingUtils.isWindowPrivate(window)) {
+      asyncStorage.setItem("devtools.netmonitor.customRequest", this.state);
+    }
   }
 
   handleChangeURL(event) {